EPE Association: EPE 2014 - LS2c: Electrical Machines

EPE 2014 - LS2c: Electrical Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 04: Electrical Machines and Drive Systems > EPE 2014 - LS2c: Electrical Machines

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   An open-ended winding IM drive with multilevel 12-sided polygonal vectors with symmetric triangles
By SUDHARSHAN KAARTHIK, K GOPAKUMAR, Jaison MATHEW, Tore UNDELAND [View]
[Download]

Abstract: Multilevel inverters with hexagonal voltage space vector structures have improved performance of in-duction motor drives compared to that of the two level inverters. Further reduction in the torque rippleon the motor shaft is possible by using multilevel dodecagonal (12-sided polygon) voltage space vectorstructures. The advantages of dodecagonal voltage space vector based PWM techniques are the completeelimination of fifth and seventh harmonics in phase voltages for the full modulation range and the exten-sion of linear modulation range. This paper proposes an inverter circuit topology capable of generatingmultilevel dodecagonal voltage space vectors with symmetric triangles, by cascading two asymmetricthree level inverters with isolated H-Bridges. This is made possible by proper selection of DC link volt-ages and the selection of resultant switching states for the inverters. In this paper, a simple PWM timingcalculation method is proposed. Experimental results have also been presented in this paper to validatethe proposed concept.

   Design of a 600kW Ring-Type Direct-Drive Flux-Switching Permanent Magnet Machine for Helicopter Main Rotor Drive
By Christian SANABRIA-WALTER, Henk POLINDER, Braham FERREIRA [View]
[Download]

Abstract: More-Electric flight is one of the main objectives of the aerospace industry for the future. For aerospace applications, electrical machines providing high torque density are paramount for the viability of direct-drive electrical propulsion of aircraft. Besides low-weight and high torque capability, a candidate solution should also be inherently fault tolerant for it to be used in aerospace. For these reasons a first solution based on Flux-Switching Permanent Magnet (FSPM) machines for an exemplary application of a helicopter main rotor drive was investigated, since these machines have shown high torque-to-weight ratios and high efficiency during research in the last decade. Despite this, the task of designing a machine appropriate for this application goes beyond the electromagnetic design and into the area of mechanical design much deeper than for traditional designs: The lightweight nature of such an iron-based machine makes the design of support structures and airgap control challenging and requires unconventional approaches. This paper presents the main design steps and first experimental results for such a machine.

   Homo-Heteropolar Synchronous Machine for Low Power Variable Speed Wind or Hydro Applications: Design, 3D FEM Validation and Control
By MARCEL TOPOR, SORIN IOAN DEACONU, LUCIAN NICOLAE TUTELEA [View]
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Abstract: In an effort to introduce a low cost (PM less), low power electric wind or hydro generators, this paper reports on preliminary design aspects, 3D FEM analysis and control of a 2.5 KVA, 250-1000 rpm, reactive homo-heteropolar synchronous machine (RHHSM).

   Magnetic cross-coupling effects on the performance of Synchronous Reluctance Motor
By Alberto COLOTTI, Konrad S. STADLER [View]
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Abstract: Performance prediction and control of a synchronous reluctance machine is based on the knowledge of the direct and the quadrature axis inductances. The properties of the machine depend on the saliency ratio of these inductances and this is implemented by introducing internal flux barriers. In an idealized linear magnetic topology the superposition principle would allow to derive both properties separately by exiting a single axis. However, in a real case with saturation effects a cross coupling of the axes appears, which alters the resulting values. Both methods are adopted in the numerical simulation and in practical measurements. By comparing the inductance values, the effects of saturation and coupling can be observed and interpreted. The ideal current trajectories in the operation regions or the resulting curves for a variable speed operation alter when different properties of the machine are assumed. The comparison to practical measurements show a certain match of the simplified methods. However, the cross coupling are more pronounced in regions with low currents and therefore the differences increase in the low flux areas at high speed.

EPE 2014 - LS2c: Electrical Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 04: Electrical Machines and Drive Systems > EPE 2014 - LS2c: Electrical Machines
	[return to parent folder]

	An open-ended winding IM drive with multilevel 12-sided polygonal vectors with symmetric triangles By SUDHARSHAN KAARTHIK, K GOPAKUMAR, Jaison MATHEW, Tore UNDELAND	[View] [Download]
Abstract: Multilevel inverters with hexagonal voltage space vector structures have improved performance of in-duction motor drives compared to that of the two level inverters. Further reduction in the torque rippleon the motor shaft is possible by using multilevel dodecagonal (12-sided polygon) voltage space vectorstructures. The advantages of dodecagonal voltage space vector based PWM techniques are the completeelimination of fifth and seventh harmonics in phase voltages for the full modulation range and the exten-sion of linear modulation range. This paper proposes an inverter circuit topology capable of generatingmultilevel dodecagonal voltage space vectors with symmetric triangles, by cascading two asymmetricthree level inverters with isolated H-Bridges. This is made possible by proper selection of DC link volt-ages and the selection of resultant switching states for the inverters. In this paper, a simple PWM timingcalculation method is proposed. Experimental results have also been presented in this paper to validatethe proposed concept.

	Design of a 600kW Ring-Type Direct-Drive Flux-Switching Permanent Magnet Machine for Helicopter Main Rotor Drive By Christian SANABRIA-WALTER, Henk POLINDER, Braham FERREIRA	[View] [Download]
Abstract: More-Electric flight is one of the main objectives of the aerospace industry for the future. For aerospace applications, electrical machines providing high torque density are paramount for the viability of direct-drive electrical propulsion of aircraft. Besides low-weight and high torque capability, a candidate solution should also be inherently fault tolerant for it to be used in aerospace. For these reasons a first solution based on Flux-Switching Permanent Magnet (FSPM) machines for an exemplary application of a helicopter main rotor drive was investigated, since these machines have shown high torque-to-weight ratios and high efficiency during research in the last decade. Despite this, the task of designing a machine appropriate for this application goes beyond the electromagnetic design and into the area of mechanical design much deeper than for traditional designs: The lightweight nature of such an iron-based machine makes the design of support structures and airgap control challenging and requires unconventional approaches. This paper presents the main design steps and first experimental results for such a machine.

	Homo-Heteropolar Synchronous Machine for Low Power Variable Speed Wind or Hydro Applications: Design, 3D FEM Validation and Control By MARCEL TOPOR, SORIN IOAN DEACONU, LUCIAN NICOLAE TUTELEA	[View] [Download]
Abstract: In an effort to introduce a low cost (PM less), low power electric wind or hydro generators, this paper reports on preliminary design aspects, 3D FEM analysis and control of a 2.5 KVA, 250-1000 rpm, reactive homo-heteropolar synchronous machine (RHHSM).

	Magnetic cross-coupling effects on the performance of Synchronous Reluctance Motor By Alberto COLOTTI, Konrad S. STADLER	[View] [Download]
Abstract: Performance prediction and control of a synchronous reluctance machine is based on the knowledge of the direct and the quadrature axis inductances. The properties of the machine depend on the saliency ratio of these inductances and this is implemented by introducing internal flux barriers. In an idealized linear magnetic topology the superposition principle would allow to derive both properties separately by exiting a single axis. However, in a real case with saturation effects a cross coupling of the axes appears, which alters the resulting values. Both methods are adopted in the numerical simulation and in practical measurements. By comparing the inductance values, the effects of saturation and coupling can be observed and interpreted. The ideal current trajectories in the operation regions or the resulting curves for a variable speed operation alter when different properties of the machine are assumed. The comparison to practical measurements show a certain match of the simplified methods. However, the cross coupling are more pronounced in regions with low currents and therefore the differences increase in the low flux areas at high speed.